Not only do more Americans have health insurance, but the number struggling with medical costs has dropped since President Barack Obama’s health care law expanded coverage, according to a study released Thursday.

About a quarter of Maryland residents who need to re-enroll in the state’s health insurance marketplace to get their correct subsidies by Jan. 1 have done so, Maryland officials said Wednesday. Now, they are urging the rest of roughly 66,000 individuals who enrolled earlier to sign up again before next week’s deadline to get coverage by the first of the year.